A note on plagiarism (please read before submission): There is a zero-tolerance policy towards plagiarism (including self-plagiarism) in our journal. Manuscripts are screened for plagiarism before, during, and after publication, and if found they will be rejected at any stage of processing. In case that a paper is already published in our journal and appears in PubMed Central but plagiarism is still detected, it will be retracted from our journal and the authors' institutions and department heads will be notified to take actions.